Title: Second law analyses on oxy-fuel combustion of gaseous fuels

Authors: Bingbing Chen; Yinhe Liu; Ke Liu; Defu Che

Addresses: School of Energy and Power Engineering, Xi'an Jiaotong University, 710049 Xi'an, China. ' State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, 710049 Xi'an, China. ' School of Energy and Power Engineering, Xi'an Jiaotong University, 710049 Xi'an, China. ' State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, 710049 Xi'an, China

Abstract: The exergy losses in the adiabatic premixed oxy-fuel combustion are quantitatively analysed. The global exergy loss decreases with increasing equivalence ratio. The exergy loss of chemical reaction is comparable to that of internal thermal energy exchange for low equivalence ratio while that of mixing process is negligible. To keep similar thermodynamic characteristics of conventional combustion, the O₂/CO₂ mole ratio should be 30/70 for oxy-fuel combustion. The exergy loss ratio on chemical reaction at the same combustion conditions is in the following order: CH₄ > H₂ > CO. The preheating of inlet oxidant improves exergy efficiency of combustion.

Keywords: adiabatic combustion; oxy-fuel combustion; exergy destruction; thermodynamic irreversibility; second law analysis; gaseous fuels; exergy efficiency.

DOI: 10.1504/IJEX.2011.043040

International Journal of Exergy, 2011 Vol.9 No.3, pp.319 - 336

Received: 18 Oct 2010
Accepted: 19 Feb 2011
Published online: 12 Oct 2011 *

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